Year	2017 PPP (% of population)
1996	52
1997	73.9
1998	74.1
1999	79.6
2000	81.6
2001	83.5
2002	72.7
2003	72
2004	70
2005	71.7
2006	72.7
2007	74.1
2008	70.2
2009	70.5
2010	70.6
2011	69
2012	65.5
2013	60
2014	57
2015	56.2
2016	56.3
2017	53.9
2018	53.9
2019	54.2
2020	58.3
2021	55.4